Winter Wren (Troglodytes hiemalis) Science Article 2 abstract We examined effects of incubation mate feeding on female incubation behavior and correlates of fitness by providing female Bewick’s Wrens (Thryomanes bewickii) and House Wrens (Troglodytes aedon) with food supplements. Males of these species vary in their rates of feeding; Bewick’s Wrens feed their incubating mates frequently, […]
Category: North America
Validity of ageing Wrens Troglodytes troglodytes on fourth primary spots
Winter Wren (Troglodytes hiemalis) Science Article 1 abstract Hawthorn (1971) described a criterion for ageing many Wrens Troglodytes troglodytes based on the number of light
Effects of back-mounted radio packages on breeding Wood Ducks
Wood Duck (Aix sponsa) Science Article 1 abstract The effects of back-mounted radio transmitters on reproductive effort and return rates of pre-nesting pairs and incubating female Wood Ducks (Aix sponsa) were investigated. Twenty of 22 pre-nesting pairs remained together after capture and radio-marking, but only two females from radio-marked pairs attempted to incubate, and none […]
DIFFERENTIAL TIMING OF WILSON’S WARBLER MIGRATIONIN ALASKA
Wilsons Warbler (Wilsonia pusilla) Science Article 2 abstract We examined age- and sex-related differences in the timing of Wilson’s Warbler (Wilsoniapusilla pileolata) migration at four locations in Alaska: Fairbanks, Tok, Mother Goose Lake, and Yakutat. ANNA-MARIE BENSON et al, The Wilson Journal of Ornithology 118(4):547-551, 2006 Download article download full text (pdf)
SURVIVAL, PRODUCTIVITY, AND ABUNDANCE IN A WILSON’S WARBLER POPULATION
Wilsons Warbler (Wilsonia pusilla) Science Article 3 abstract We analyzed patterns in the abundance, productivity, and survivorship of a coastal California population of Wilson’s Warbler (Wilsonia pusilla) using capture-recapture data from 18 years of standardized mist-netting conducted during the breeding season. MARY K. CHASE et al, The Auk 114(3):354-366, 1997 Download article download full text […]
FIRST RECORD OF WILSONS PHALAROPE, PHALAROPUS TRICOLOR, FOR TOBAGO
Wilsons Phalarope (Phalaropus tricolor) Science Article 1 abstract On 28 September 1990, Charles and Betty Crabtree, Andrew Cunningham, Faye Barnes, Mary Hurd, and the authors discovered a Wilson’s Phalarope (Phalaropus tricolor) at Buccoo Marsh, Tobago, West Indies William L. Murphy, Trevor Yip Hoi and Adolphus James, J. Soc. Conserv. Study Carib. Birds) 4(2):2-3 Download article […]
Territorial behaviour and population dynamics in red grouse Lagopus lagopus scoticus. II. Population models
Willow Ptarmigan (Lagopus lagopus) Science Article 1 abstract 1) Recent experiments on cyclic red grouse populations discovered that aggressiveness, induced by testosterone implants, depressed population density for more than a year after the implants were exhausted. 2) This confirms the observation, also made in previous studies of this territorial species, that aggressiveness can determine population […]
Willow ptarmigan chicks consume moss sporophyte capsules
Willow Ptarmigan (Lagopus lagopus) Science Article 5 abstract Willow Ptarmigan( Lagopus lagopus) chicks consumes sporophyt capsules, a moss, istichiumin clinatuma, at La Perouse Bay, near Churchill, Manitoba, Canada.S ix chicks(6 -16 days old) were examined over 3 yr, and crops of all chicks containemd moss capsules.In two chicks, capsules represented a substantial portion of the […]
Evidence of re-nesting after brood loss in Red Grouse Lagopus lagopus scoticus
Willow Ptarmigan (Lagopus lagopus) Science Article 9 abstract The Red Grouse Lagopus lagopus scoticus is a single-brooded species that can re-lay if a clutch is lost during the nesting period (Cramp & Simmons 1980). However, there is no reported evidence regarding second clutches being attempted after a brood of young chicks is lost. Indeed, there […]
OFFSHORE MARINE OBSERVATION OF WILLOW PTARMIGAN,INCLUDING WATER LANDINGS, KUSKOKWIM BAY, ALASKA
Willow Ptarmigan (Lagopus lagopus) Science Article 10 abstract We report an observation of Willow Ptarmigan (Lagopus lagopus) encountered 8 to 17 kmfrom the nearest shoreline on Kuskokwim Bay, Alaska, on 30 August 2003. The ptarmigan were observed flying,landing on our research vessel, and landing and taking off from the water surface CHRISTIAN E. ZIMMERMAN et […]